This selectivity of ion exchange resin is related to the following factors:
1. The more charge the ion band is, the easier it will be adsorbed by anion exchange resin. For example, divalent ions are more easily adsorbed than monovalent ions.
2. For the ions with the same amount of charge, the ions with larger atomic order are easier to be adsorbed.
3. Compared with the dilute solution, the base ions in the concentrated solution are easy to be adsorbed by the resin. Generally speaking, for H-type strong acid cation anion exchange resin, the selection order of ions in water. For Oh type strong basic anion exchange resin, the selection order of anions in water is better. This selectivity of anion exchange resin is very useful for analyzing and distinguishing the process of chemical water treatment.
Control the quality of resin inlet water:
1. Turbidity of water: downstream AC ≤ 5mg / L, convective AC ≤ 2mg / L. Ion exchange resin
2. Residual active chlorine: free chlorine ≤ 0.1mg/l.
3. Chemical oxygen demand (COD) ≤ 1mg / L.
4. Iron content: compound bed AC ≤ 0.3mg/l, mixed bed AC ≤ 0.1mg/l.
After 10-20 weeks of operation, the pollution status of cation exchange resin was checked. If any pollution is found, it should be dealt with in a timely manner.
Post time: Jun-09-2021